CN105244915A - Crowbar circuit used for doubly-fed wind power converter low voltage ride through - Google Patents
Crowbar circuit used for doubly-fed wind power converter low voltage ride through Download PDFInfo
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- CN105244915A CN105244915A CN201510746024.6A CN201510746024A CN105244915A CN 105244915 A CN105244915 A CN 105244915A CN 201510746024 A CN201510746024 A CN 201510746024A CN 105244915 A CN105244915 A CN 105244915A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a Crowbar circuit used for doubly-fed wind power converter low voltage ride through. The Crowbar circuit comprises a rectification circuit, a DC supporting capacitor, a switching circuit, an energy discharge circuit, a charging circuit and a converter DC bus. The input end of the rectification circuit is connected with the three phases of a doubly-fed power generator rotor winding. The DC supporting capacitor is connected in parallel with the output end of the rectification circuit. One end of the charging circuit is connected in parallel with the DC supporting capacitor, and the other end is connected in parallel with the converter DC bus. The switching circuit is connected in series with the energy discharge circuit and then connected in parallel with the DC supporting capacitor. According to the Crowbar circuit used for doubly-fed wind power converter low voltage ride through, high-frequency current generated on a rectification diode is enabled to be within safety allowed range when a converter rotor side is started through innovation of the circuit and additional arrangement of the charging loop so that reliability of the whole Crowbar circuit is enhanced.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, relate to a kind of double-fed wind energy converter low voltage crossing Crowbar circuit.
Background technology
Wind energy in regenerative resource is the new forms of energy that development in recent years is the fastest, installed capacity is maximum, and along with the increase of wind power generation set grid-connection quantity, influencing each other of electrical network and wind turbine generator is obvious all the more.Work as electric network fault, go out existing network pressure when falling, because double-fed aerogenerator stator magnetic linkage can not suddenly change, therefore there will be DC component and zero-sequence component in stator voltage, so comparatively large-slip can be produced relative to rotor, thus double-fed wind power generator rotor side winding is made to produce overvoltage and overcurrent phenomenon.
The overvoltage of double-fed wind power generator rotor side and overcurrent will produce current transformer rotor-side and rotor winding to be damaged; so in order to protect current transformer rotor-side and rotor winding during electric network fault; make double-fed wind energy converter possess the ability of low voltage crossing, need Crowbar device (crowbar device) is installed.
At present newly current transformer that grid-connected wind turbine generator uses is installed all with active Crowbar device, and substantially can meets the requirement of low voltage crossing new national standard, but all there is certain deficiency in himself protection and reliability thereof.Domestic active Crowbar mostly adopts Fig. 1 (public announcement of a patent application CN103986341A) this circuit structure: the advantage of this structure is that main circuit topology is simple, can effectively suppress to turn off overvoltage by DC support electric capacity, conventional Breakdown Voltage Power switching device can be selected simultaneously, reduce type selecting difficulty and cost.
For this active Crowbar of Fig. 1 in actual use, its weak point starts in wind electric converter rotor-side to charge to Crowbar intermediate energy storage electric capacity instantaneously, the process of high-frequency rectification will be there is in the rectifier diode in the uncontrollable rectifier bridge UR of three-phase, and it turns off restorability difference in high frequency, cause on rectifier diode by larger high-frequency current, make heat rapid accumulation, its reliability and life-span is caused to reduce fast, directly burn out time serious, want normally to complete high-frequency rectification then to need to select fast recovery diode, but general fast recovery diode allows the voltage passed through, current rating maximum is lower, and price is relatively very expensive, therefore taking cost into account cannot meet the demands, so be badly in need of the more rational Crowbar circuit of one to solve the problems referred to above.
Summary of the invention
Object of the present invention is exactly the deficiency for existing active Crowbar circuit, improves circuit, provides a kind of Crowbar circuit of high reliability.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of double-fed wind energy converter low voltage crossing Crowbar circuit, comprise rectification circuit, DC support electric capacity, switching circuit, energy leadage circuit, charging circuit and current transformer DC master row, the input of described rectification circuit is connected with three of double-fed generator rotor windings, described DC support Capacitance parallel connection is at the output of described rectification circuit, described charging circuit one end is connected with described DC support Capacitance parallel connection, the other end and described current transformer DC master row are connected in parallel, be connected with described DC support Capacitance parallel connection after described switching circuit and described energy leadage circuit are connected in series.
As a kind of preferred implementation of the present invention, described charging circuit comprises diode, resistance one and resistance two, described diode and described resistance one are connected in series rear one end and are connected with described DC support capacitance cathode, the other end is connected with described current transformer DC master row positive pole, described resistance two one end is connected with described DC support electric capacity negative pole, and the other end is connected with described current transformer DC master row negative pole.
As a kind of preferred implementation of the present invention, described diode cathode is connected with described resistance one, and described diode cathode is connected with described DC support capacitance cathode.
As a kind of preferred implementation of the present invention, described diode cathode is connected with described current transformer DC master row positive pole, and described diode cathode is connected with described resistance one.
As a kind of preferred implementation of the present invention, described switching circuit adopts IGBT power tube.
As a kind of preferred implementation of the present invention, described energy leadage circuit comprises the fly-wheel diode and energy bleeder resistance that are connected in parallel.
As a kind of preferred implementation of the present invention, described Crowbar circuit also comprises discharge resistance, and described discharge resistance is connected with described DC support Capacitance parallel connection.
As a kind of preferred implementation of the present invention, described rectification circuit is the uncontrollable rectifier bridge of three-phase.
Compared with prior art, beneficial effect of the present invention is as follows: double-fed wind energy converter low voltage crossing Crowbar circuit provided by the invention passes through innovative circuits, increase charge circuit, the high-frequency current produced on rectifier diode when current transformer rotor-side is started, within safe allowed band, improves the reliability of whole Crowbar circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is prior art circuits schematic diagram;
Fig. 2 is the embodiment of the present invention 1 circuit theory diagrams;
Fig. 3 is double-fed wind power generator group schematic diagram;
Fig. 4 is the embodiment of the present invention 2 circuit theory diagrams.
Reference numeral: 201, rectification circuit, 202, switching circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
As shown in Fig. 1 ~ 4, a kind of double-fed wind energy converter low voltage crossing Crowbar circuit, comprise rectification circuit (the uncontrollable rectifier bridge UR of three-phase), DC support electric capacity C, switching circuit, energy leadage circuit, charging circuit CC and current transformer DC master row, the input of rectification circuit is connected with three of double-fed generator rotor windings, DC support electric capacity C is connected in parallel on the output of rectification circuit, charging circuit CC one end and DC support electric capacity C are connected in parallel, the other end and current transformer DC master row are connected in parallel, switching circuit and energy leadage circuit are connected in series afterwards and DC support electric capacity C is connected in parallel.
In the present embodiment, Crowbar circuit also comprises discharge resistance R1, and discharge resistance R1 and DC support electric capacity C is connected in parallel.
In the present embodiment, switching circuit adopts IGBT(insulated gate bipolar transistor) power tube.
In the present embodiment, energy leadage circuit comprises the sustained diode 1 and energy bleeder resistance R2 that are connected in parallel.
In the present embodiment, rectification circuit is that the uncontrollable rectifier bridge UR(of three-phase comprises 6 rectifier diodes).
In the present embodiment, charging circuit comprises diode D2, resistance one R3 and resistance two R4, diode D2 and resistance one R3 are connected in series rear one end and are connected with DC support electric capacity C positive pole, the other end is connected with current transformer DC master row positive pole, resistance two R4 one end is connected with DC support electric capacity C negative pole, and the other end is connected with current transformer DC master row negative pole.
As shown in Figure 2, diode D2 positive pole is connected with resistance one R3, and diode D2 negative pole is connected with DC support electric capacity C positive pole.
In the present embodiment, DC support electric capacity C, discharge resistance R1, charging circuit CC(comprise resistance R3, R4 and diode D2), insulated gate bipolar transistor IGBT, energy bleeder resistance R2, sustained diode 1, wherein: the input of the uncontrollable rectifier bridge UR of three-phase is connected with three of double-fed generator rotor windings, is converted to direct current energy for the AC energy exported by rotor windings; DC support electric capacity C is connected in parallel between three-phase uncontrollable bridge rectifier bridge UR output, for reducing the shutoff overvoltage of switching circuit; Discharge resistance R1 is connected in parallel on DC support electric capacity C two ends, the energy on the DC support electric capacity C that releases; Charging circuit CC circuit is from Ud+, one end of contact resistance R3, the anode of diode D2 is connected to again by the other end of resistance R3, DC+ is connected to again from the negative electrode of diode D2, another circuit from Ud-, one end of contact resistance R4, then be connected to DC-by the other end of resistance R4, this charging circuit is used for charging to DC support electric capacity C, reduces the high-frequency current that rectifier diode when wind electric converter rotor-side starts on the uncontrollable rectifier bridge UR of three-phase flows through; The collector electrode of insulated gate bipolar transistor IGBT is connected with DC+, and emitter is connected with EK, and it is according to rotor-side overvoltage and overcurrent condition, receives instruction, carries out the conversion of on off state; Energy bleeder resistance R2 and sustained diode 1 are in parallel, for by the power conversion of rotor-side being heat energy release; The anode of sustained diode 1 is connected with DC-, and negative electrode is connected with EK, closes the afterflow of having no progeny for IGBT.
In the present embodiment, resistance R3, R4 in charging circuit CC can be one, also can be connecting to form arbitrarily of two or more resistance; The position of resistance R3 and diode D2 can exchange; The position of insulated gate bipolar transistor IGBT can exchange with the position of the entirety that energy bleeder resistance R2 and sustained diode 1 form; Insulated gate bipolar transistor IGBT and sustained diode 1 can adopt the form of one or more parallel connection to form, and wherein insulated gate bipolar transistor IGBT can also adopt other device for power switching that can reach same function to substitute; Discharge resistance R1 and energy bleeder resistance R2 can be one, also can also be the form composition that two or more resistance connect arbitrarily; Electric capacity C can be the form composition of one or more any connection.
In the present embodiment, before startup wind electric converter rotor-side, charging energy-storing can be carried out by charging circuit CC to DC support electric capacity C, stop charging when its voltage reaches set point; When on current transformer DC master row, voltage is higher than voltage on DC support electric capacity C, current transformer also can carry out automatic charging to DC support electric capacity C, until can not fill again.
In the present embodiment, in double-fed wind power generator group running, when line voltage falls fault time, control system in double-fed wind power generator group is after determining to there occurs low voltage failure state, signal can be sent, Crowbar is cut in the middle of the rotor windings loop of double-fed wind power generator fast, and insulated gate bipolar transistor IGBT is open-minded fast, is directly discharged fast by energy bleeder resistance R2 by the energy of rotor-side; When rotor current or Crowbar direct voltage reach the safe range of setting, control system sends Crowbar switching out signal, and Crowbar then cuts out fast.If simultaneously during the voltage of current transformer direct voltage higher than Support Capacitor C two ends, all automatically can charge to it, make the voltage on DC support electric capacity C keep certain value.
The overvoltage produced when the present invention adopts DC support capacitive absorption device for power switching to turn off, absorbing circuit is simple, and device is few.
Invention increases charging circuit, take, first to after Crowbar DC support capacitor charging, just to start the mode of current transformer rotor-side, reduce the high-frequency electrical flow valuve flowing through rectifier diode, reduce the requirement to rectifier diode, the reliability of whole Crowbar circuit is improved.
The present invention makes energy can only flow to Crowbar circuit direct side from current transformer DC side by diode; energy is not allowed to pour in down a chimney to current transformer DC side; reduce the high-frequency electrical flow valuve that rectifier diode produces, thus protect the rectifier diode in the uncontrollable rectifier bridge UR of three-phase.
Embodiment 2
Other conditions of embodiment 2 are all identical with embodiment 1, are with the difference of embodiment 1:
As shown in Figure 4, diode D2 positive pole is connected with current transformer DC master row positive pole, and diode D2 negative pole is connected with resistance one R3.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a double-fed wind energy converter low voltage crossing Crowbar circuit, it is characterized in that, comprise rectification circuit, DC support electric capacity, switching circuit, energy leadage circuit, charging circuit and current transformer DC master row, the input of described rectification circuit is connected with three of double-fed generator rotor windings, described DC support Capacitance parallel connection is at the output of described rectification circuit, described charging circuit one end is connected with described DC support Capacitance parallel connection, the other end and described current transformer DC master row are connected in parallel, be connected with described DC support Capacitance parallel connection after described switching circuit and described energy leadage circuit are connected in series.
2. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 1, it is characterized in that, described charging circuit comprises diode, resistance one and resistance two, described diode and described resistance one are connected in series rear one end and are connected with described DC support capacitance cathode, the other end is connected with described current transformer DC master row positive pole, described resistance two one end is connected with described DC support electric capacity negative pole, and the other end is connected with described current transformer DC master row negative pole.
3. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 2, it is characterized in that, described diode cathode is connected with described resistance one, and described diode cathode is connected with described DC support capacitance cathode.
4. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 2, it is characterized in that, described diode cathode is connected with described current transformer DC master row positive pole, and described diode cathode is connected with described resistance one.
5. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 1, is characterized in that, described switching circuit adopts IGBT power tube.
6. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 1, it is characterized in that, described energy leadage circuit comprises the fly-wheel diode and energy bleeder resistance that are connected in parallel.
7. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 1, it is characterized in that, described Crowbar circuit also comprises discharge resistance, and described discharge resistance is connected with described DC support Capacitance parallel connection.
8. double-fed wind energy converter low voltage crossing Crowbar circuit as claimed in claim 1, it is characterized in that, described rectification circuit is the uncontrollable rectifier bridge of three-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746024.6A CN105244915B (en) | 2015-11-06 | 2015-11-06 | Crowbar circuit for low-voltage ride through of double-fed wind power converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746024.6A CN105244915B (en) | 2015-11-06 | 2015-11-06 | Crowbar circuit for low-voltage ride through of double-fed wind power converter |
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| CN105244915A true CN105244915A (en) | 2016-01-13 |
| CN105244915B CN105244915B (en) | 2020-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285519A (en) * | 2021-04-27 | 2021-08-20 | 北京城建智控科技有限公司 | High-reliability power supply circuit topology with redundancy design |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008154334A (en) * | 2006-12-15 | 2008-07-03 | Matsushita Electric Ind Co Ltd | Power conditioner |
| CN102790404A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Doubly-fed wind generation set with low-voltage ride-through function |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
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2015
- 2015-11-06 CN CN201510746024.6A patent/CN105244915B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008154334A (en) * | 2006-12-15 | 2008-07-03 | Matsushita Electric Ind Co Ltd | Power conditioner |
| CN102790404A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Doubly-fed wind generation set with low-voltage ride-through function |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285519A (en) * | 2021-04-27 | 2021-08-20 | 北京城建智控科技有限公司 | High-reliability power supply circuit topology with redundancy design |
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